It is known that about 25% of residents in a large town exercise regularly. For a random sample of 4 residents from this town, let x denote the number of those who exercise regularly.

Find the probability P(x greater than or equal to 1)
a) 0.004 b) 0.996 c)0.316 d) 0.684 e) none

Question

It is known that about 25% of residents in a large town exercise regularly. For a random sample of 4 residents from this town, let x denote the number of those who exercise regularly.

Find the probability P(x greater than or equal to 1)
a) 0.004 b) 0.996  c)0.316 d) 0.684 e) none

ribhu · Answer

let us assume that there are 100 residents. 
so 25 residents exercise regularly. 
now the probability will be favourable outcome/ possible number of outcomes. 
numerically $$25C4/ 100C4$$

ribhu · Answer

explanation:number of ways of selecting 4 people out of 25 people who exercise/number of ways of selecting 4 people out of 100.

ribhu · Answer

@aayushi.somani  check this one out

ribhu · Answer

the answer would be choice a) .004

ribhu · Answer

@iGreen. check this one out

ribhu · Answer

@aayushi.somani is my solution correct??

anonymous · Answer

Hmm..this is a tricky problem..I'm not sure.

aayushi.somani · Answer

you probably r right  :)

ribhu · Answer

probably or  r u sure? @aayushi.somani

aayushi.somani · Answer

i calculated and i got the same

ribhu · Answer

you deployed the same method?

aayushi.somani · Answer

actually yeah.. I believe that is a correct method